The Perseid meteor shower will burst into light this August as Earth passes through the long trail left by Comet Swift-Tuttle. This year, though, the moon may interfere with the show. Here's how and when to see the Perseids.

A small, lightweight life-detection package has passed a key trial here on Earth, suggesting that it could someday hunt for microbes on Mars or the ocean moons of the outer solar system, researchers say.

Two NASA astronauts embarked on a spacewalk today (Jan. 23) and successfully replaced a degraded piece of equipment outside of the International Space Station, despite a software glitch that left the team running behind schedule.